AWWA (504 94 . . 0783350 0502442 173 . .
American Water Works Association
ANSI/AWWA C504-94
(Revision of ANSI/AWWA C504-B7)
AWWA STANDARD
FOR
.,
RUBBER-SEATED BUTTERFLY VALVES
SECTION 1: GENERAL
Sec. 1.1 Scope
This standard covers rubber-seated butterfly valves, 3 in. (75 mm) through
72 in. 0,800 rnrn) in diameter, with various body and end types, for fresh water
having a pH range from 6 to 10 and a temperature range from.<!3°, to 125°F (0.6° to
52°C). This standard covers rubber-seated butterfly valves suitable for a maximum
steady-state fluid working pressure of 150 psig 0,034 kPa lgaugal), a maximum
steady-state differential pressure of 150 psi 0,034 kPa), and a rp1!~'!'u.1)1_v..elo.cityoC
16 I1/s (4.9 m/s).
1.1.1 Body types, classes. and sizes. Valves covered by this standard are furnished in four body types and in classes as follows'
1.1.1.1 Wafer valves. Class 150B, in sizes 3-20 in. (75--500 mrn),
1.1.1.2 Short-body flanged valves. All classes. in sizes 3-72 in. (75--1,800 mm).
1.1.1.3 Long-body nanged valves. Class 75A, class 75B, class 150A, and class
150B, in sizes 3--72 in. (75--1,800 mm),
1.1.1.4 Mechanical-joint-end valves. Class 150B, in sizes 3--24 in. (75-600 rnm),
and all classes in sizes 3(}...48 in. (75a-1.200 mrn),
1.1.2 Definition of classification. In each case, the~ri':..illsj~on represents the pressure rating (the maximum steady-state fluid working pressure, in
pounds-per-square-inch gauge) and also the maximum steady-state differential pressure, in pounds per square inch, for which the valve is designed. The design~
"A" and "Jr define the flow-rate capabilities with the valve in the fully open position. "A" valves are rated for a maximum velocity of 8 ftJs (2.4 m/s), and "B" valves
are rated for a maximum velocity of 16 I1/s (4.9 rn/s) in the piping section upstream
of the valve.
1
'11 by t he A~lfR1CI\tJ WATER WORK'S ASSOC1AT]ON (AWWA)
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